"Also, out of curiosity, I'd love to know what exactly is in these packages you're sending out."
I try to tailor to the Interest of who I am sending it to.
example, One I sent out had some LED's, op amps with sockets lm317 reg's with heat sinks, also a 7824 with heat sink,some diodes.a few low voltage caps ,1500' of 30ga magnet wire a proto board with some leads. a few meters of solder. some 22ga. wire, some dip circuit boards, ardunio uno , npn and pnp transistors. small n channel mosfets and of course a 555 timer with a socket.
regards
bill