Is there a “weep hole” or drain hole in the muffler of a 2004 Nissan Frontier?

My son has a 2004 Nissan Frontier xe-v6. I saw fluid dripping out of it at about the midway point of the truck. When I looked underneath it looked like the water was coming from a small hole in the forward side of the muffler. I drove the truck for a few minutes to warm it up to see if it was just moisture from exhaust condensation. When I checked again in about 5 minutes no fluid was dripping. That leads me to believe it is simply condensation from warm air on a cold morning that would sometimes be seen coming out of the back of the exhaust. I thought about using a steel putty to seal the hole but when I looked at it better the hole seems too perfect to be from rust or to have just developed. There is no rust around the hole or on the muffler that I can see. I have read that some mufflers have a "weep hole". Until researching this I had never known of any vehicle that has this but it makes some sense as the collection of this condensation is what can cause rusting in the bottom of any part of the exhaust system. I am now a little leery of patching up an intentional hole. Have I gotten some bad information about the "weep hole" even existing?
Any help on this would be appreciated.
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