Looks like a nice package, did you get a good deal?
The powerfeed is a nice addon, looks like the LMS model.
LittleMachineShop.com - Mini Mill Power Feed Kit, No Feed Screw
Seems to be an MT spindle and you already have your collets and chuck plus a couple spare drawbars.
The bag of gears looks like either a changegear set for a minilathe or he got a bunch of replacements
for the mill head.
A belt drive from LMS will take that problem out of the picture.
LittleMachineShop.com - Belt Drive Conversion Kit, Mini Mill
You can find lots of stuff to do to/with the mill here.
Have fun, Hoss