Andrew,

You should pull the trigger on the remaining prime. Isn't the one you have only 99.95% MISB? Wasn't the binder removed once by the previous owner? How does it feel to know that your TFC collection is only 99.95% MISB?

(this was the persuasion trick he used to get me to buy two MISB #10 Soundwaves when I was perfectly happy with my one MIB Soundwave)

Get this one, and sell off the one you have now. You'll end up pocketing a few bucks, and getting a true 100% MISB TFC 00 Prime. You think it's crazy, but you'll sleep better at night knowing your entire TFC collection is 100% MISB.