3 separate packages would be the best option in my opinion.
Package 1- Texan, BD and SK-19
Package 2-Seneca .50, Hatsan .25
Package 3-Compressor and tank
Package 1 is for the more serious crowd. I’d agree with most as 2 of the 3 will be keepers.
Package 2 more on the entry side with the ability to hunt with the .50 if your state allows it.
Package 3 everyone needs air- priced right they will all go. Consider local pick up within a certain distance. Hopefully the buyer has a place to test, as a full tank of gas will guaranteed be cheaper than shipping.