If one got the bigger check and the request to refund the money, you could hop on down to the local cop shop and see if they were interested. If they aren’t, you could tell the scammers that your dog ate the check.
Probably not a good idea to play junior detective.
The package forwarding alone is a well known scam.
Someone orders something off eBay using a stolen credit card. You pick it up and forward it to them. No doubt the address is outside the US. (The eBay seller probably doesn’t want to sell overseas directly because of the chance of scam.)
If the police magically decide to investigate, guess who is on the hook for the theft? C’mon, guess.
The reply is a catch-all of testing if you are completely brain dead. Anyone who doesn’t notice all the multiple frauds being offered is an ideal patsy.