HELP! Gifts from unknown person! Know any Reverse phone number websites?

Hello, my friend feels she may be being stalked. She got an expensive gift in the mail for Valentines day and the person who sent them to her didn't leave his/her name. All he/she left was a number and email adress.

The email adress doesn't work and the phone number goes to a voice mail of a song. No name, nothing. We don't know if it's a landline or what but usually when I send Txt messages to someone my phone will let me know and it hasn't responded to me that it's a land line. I assume its a cell phone but I'm not sure.

All the reverse number sites I have found require you to pay. Was wondering if there was a free one before I have to use one that needs payment.

Please and thank you! Any information would be greatly appreciated! Maybe numbers to find out some information of this person as well would be welcomed!