what does it mean when a parcel from china has been seized by customs?

It means the parcel is contaminated with coronavirus.

It means you won't be getting the package.

Orthodoxy = the only true faith; Roman Catholics tried one cup - one spoon ritual and got sick with Bubonic plague; if heresy enters Orthodox monastery then monks/nuns will get sick with flu/tuberculosis (for instance); Orthodox churches who closed for COVID or had disposable cups/spoons are no longer brides of Christ (now they serve Satan and honor Satan's new COVID religion).

Priests who were working for KGB (that is spying on people and betraying their confession) = Sergian heresy. Now, CIA and FSB (new name for KGB) don't need to have priests constantly reporting because of new technology (bugs) that allows them to listen in (and if cameras are present... to look into what people are doing). Do you want the Holy Spirit to defend you or you want the antichrist to defend you using cameras? Your phones spy on you; don't bring them to church.

Wax candles, antimins (remains of saints sewn into a towel), one cup, one spoon, non-Kosher non-barcoded non-QRcoded non-yeast bread/wine...

Three biggest saints in this order: (1)Theotokos Virgin Mary; (2)John the Baptist who was beheaded on 9/11 (soccer ball = John the Baptist’s head); (3)Tsar Nicolas 2nd = redeemer from lower caser “r” (while Christ is “Redeemer” from capital “R”).

Patriarch Kiril of Russia is enemy of Christ and should be executed; give me a gun now to shoot Kiril; not only Kiril but all the traitors from all local Orthodox churches; last Orthodox Patriarch = Irenaios 1st of Jerusalem; Irenaios blessed Catacomb movement more than five years ago.

Ecumenism = 263 heresies; each heresy leads to hell; Priests who participate in ecumenism/COVID restrictions will have Pagans walking on their heads in hell.

Arkhimandrite Antonin Kapustin left a prophecy that Church of All Russian Saints in Gorny Monastery, Ein Karem, Israel will be blessed by forerunner of antichrist; pseudoPatriarch Kirill of Russia and Mark of Berlin blessed this church in 2007. When priests pray for current gov't (instead of praying for future Tsar), Jesus gets up from His throne and turns His back to them.

Matthew 18:15-17; 15 “If your brother or sister[a] sins,[b] go and point out their fault, just between the two of you. If they listen to you, you have won them over. 16 But if they will not listen, take one or two others along, so that ‘every matter may be established by the testimony of two or three witnesses.’[c] 17 If they still refuse to listen, tell it to the church; and if they refuse to listen even to the church, treat them as you would a Pagan or a tax collector”.

English Psalm 96:5 (Russian Psalm 95:5); “Because all gods of Pagans are demons. The LORD created the heavens”; forgive me.

means customs is doing there  job ..you bought something that the customs dont allow .

It means you aren't getting your package. Customs seize packages all the time for various reasons--most likely counterfeit goods or forbidden purchases. 

Counterfeits from China are rampant, and a major reason for customs seizures. But there could be a number of other reasons, e.g. illegal in your country, unsafe product, etc. Seized parcels are typically destroyed.

It means that the Customs authorities in your country have seized whatever you tried to have imported. 

That typically happens for controlled drugs, dangerous or banned items (including counterfeits), illegal drugs, and for many types of foodstuffs.

Customs cannot prove that you weren’t an innocent recipient but they send a letter anyway to let you know that the stuff being sent to you has been seized. 

You are fully responsible for ensuring that whatever you ordered from another country is legal for importation. That is not the seller’s job. You ordered, you paid, they sent it.

Customs will send a letter to the person who was supposed to get it. For example, if you bought a controlled substance it will ask for a letter from your Dr. With that they will give it to you.

Something dodgy inside.

The contents might be suspect.