But also, would they accept my trade offer for moneypak if i provided proof that i purchased the card?
About the only interaction a bank has with MoneyPak is being able to use it to load a prepaid debit card. There are not any standing offers to sell bitcoins for MoneyPak that I'm aware of.
Im talking about people on here. They have the currency exchange section where a people i see trade moneypak for bit coin.