The 5 pack would be best as a mix in my opinion, but as the rules state, you don't know what you are getting and the next BOTL has no idea what they are receiving. Trust and integrity runs deep on this site, so this should be looked at as a chance to treat your fellow geeks to whatever you feel is best. Labels should definitely be left on. The only stupid question, is the one you don't ask!!
One thing I did not mention, once the pass is over and closed, each participant should post a pic of what they received. To keep the integrity of the pass intact, mums the word as to what you get and what you send out until this thing has "passed"!! So...who's in?