Great bundle of mibs. It's very kind of you to being helping your father. With regard to the mibs, I suppose it comes down to how much time you want to spend, and how much money you hope to make. In searching completed listings I didn't see any larger bulk lots of bumbles the size of what you have, so you definitely have something unique in that sense.
It's easy to get tripped up on how best to sell things in terms of bundling, price, etc. Try to pick a jumping off point and go from there. If you don't want to hassle with it too much, maybe list the entire lot for whatever price you're wanting. Or, test the waters with a couple smaller lots, and make changes as you go.
As an aside, I'm unsure if this forum has a members Sales and Trade section, but perhaps you will find members here who are interested. Additionally, AAM has a Buy Sell Trade section, so if you're a member there as well, you may want to look into it as a possible option. As a Best Practice, always read the respective forum and section rules of what is required, before starting a sales thread.
Apologies for the longwinded reply. Hope you make a mint...cheers!