When I was a kid and would send very stuffed letters, we just left a dollar paper clipped to it, they would leave the change the next day for heavier stuff.

When I was even younger I used to leave flowers in the mailbox for the mail person, and they got me a little flower statue for xmas and left it in the mailbox for me. That’s a memory I haven’t thought of in a long time so that was pleasant :)

Better yet, use some thin sliced ham wrapped around cheese and whatever red sauce (bbq, ketchup, marinara, whatever) to create a gooey cavity in the middle…