Sorry to necro a thread, but as far as I'm aware the bulk of the Blue/White Test cards that have been sold came out of packs that were in the same boxes the Aqueous Test cards were found. The sheet in the Youtube video was a one off.
This is an email I got in 2008 from Chandy G, one of the original finders of the Aqueous and Blue/White Test cards:
"Hi---thanks for your note.....yes, I was one of the original purchaser of these cards....I think there was one other purchaser on the aqueous test cards somewhere in the Milwaukee area; while there may be another source for the blue/white cards, I haven't found it yet.....peculiar story how I came across this group; I sent this e-mail out several years ago and saved a copy....have copied it on here for you.....best wishes, Chandy
I bought them with ABSOLUTELY no idea what I was getting.......had a phone call one Saturday morning from a gentleman who explained that he was an ex-employee at Donruss (actually, packaging director). He told me that he had been given a few wax boxes when he left the company and wondered if we were buying....he explained that they were 1988-1992 product, and that there were 20 boxes, mostly 1990-1992 Donruss and Leaf along with a few 1988 Donruss........really exciting stuff......well, maybe not......
He mentioned one 1990 Leaf box, and I made him an offer on the group equal to the value of that one box, since everything else he listed was what I would call junk wax which I figured to be my profit on the deal.
At any rate, he arrived at my store just as I was leaving for my daughter's soccer game (I was team coach and had to be there).....we had agreed on a price, so my assistant paid him and he left (without any conversation with me at all).
When I returned to the store later that afternoon, my assistant had moved the boxes back to the back room. I took a quick look and noted that there were 3 boxes which were not regular Donruss boxes, but rather plain white cardboard boxes with a memo, something to the effect of "Donruss Canada", on the side.....at this point, I opened one of the boxes (in regular 1990 Donruss wrappers) and encountered a pack full of the "blue-white" cards from this ad......having been a collector of and fascinated by proofs, errors, and variations all my collecting career, I about went through the ceiling......but had no way to contact the person I bought them from for any information.
After looking at those, I started perusing all of the other boxes and discovered that the boxes of 1990 Donruss cellos I had purchased all had the "Aqueous Test" overprint on the backs of the cards inside (see some of my other ads).
As you can see, all of these cards came from packs....they weren't cut from sheets, although I'm sure that with these as with any card product, there was an uncut sheet at one time........my guess is that they were different ink tests, one for color, the other for water solubility, but I don't know anything more than you do in that area......
Hope this is of some interest...will check on the Valenzuela and get back to you ASAP---thanks, Chandy"
