Surprise! I actually made a newbie mistake here- they gave me a couple extra keys. I didn't count the total number of sets I have, I just assumed that since I was missing a couple keys from a set, I had a problem. I do have 25 addon kits- no worries.
As for the base kits, they're all sorted now too. I ended up with almost two kits worth of extra keys, 76 kits total, and a splitting headache. I'm gonna sell the one extra on the classifieds, since I've sold my WYSE kit (and cherry boards,) and use the others to mitigate any problems that may arise during shipping to the original buyers. I also double checked all the bags, since I didn't know that SP would pack extra keys, and thought that some kits weren't right because I had an extra alt, backspace, and iso shift. However, I found that those were extra. I did catch a bag with an extra control and a bag with no controls, however, and fixed those. At this point, I'm waiting on the bubble mailers I ordered from Amazon last week, and then I'll start shipping them out to you guys.
EDIT: Got the mailers just now. I'll be shipping out on Monday.