Sorry about the guy who didn't send a proper thank you. I see people ask a particular question on here, ten guys respond, and the guy never has the common courtesy to even say thank you. It doesn't happen every time, but way too often.
The responses you got on the trading something for a gifted bird were probably accurate. Wild Migratory Waterfowl can not be bartered with in any form. No money, no trading, and no gifts in return. The thank you that you talked about is all that is allowed. Yes, the receiver can pay for postage, but not a penny more, and absolutely no handling fees. And please don't think I need a thank you in response for this info.