Great topic, Darren. I wish I could help more. I have only seen a 35mm clip from 'The Floorwalker' a couple of years ago on Ebay (didn't buy it). Of course, I have no way of knowing if this was clipped from a worn out original theatrical print, or if it was simply a 35mm dupe.
I'm also not sure how many (if any) of the 16mm toy films were sourced from 35mm clips that were also distributed as toy films (obviously, all of them were sourced from 35mm at some point!).
I would LOVE to see a list of Toy films, with a description of what the source film is, and quality - not all of them are worthless, for sure. Unfortunately, it's such a pig-in-a-poke that I've stopped buying them (not to mention they go on Ebay for prices far in excess of what I think they're really worth!).
A member of this group who probably wishes to remain anonymous just sent me a tape with a number of dubs of Toy Films on it, and I have a small pile myself. Since it's a lazy Sunday afternoon, and muggy as hell here in New Jersey today, I don't mind listing them for you

All of these are from 50 foot reels (1 1/2 - 2 minutes).
1. Hollywood Film Enterprises (346) Charlie The Nurse Maid Good quality material containing the first few minutes of 'His Trysting Place.' This is the footage that's missing from Blackhawk's print!
2. Hollywood Film Enterprises (365) Charlie And Tillie's Flirtation Good quality material containing the entire 2 minute fence scene which is missing from the Image DVD.
3. Empire Safety Film Co. Charlie And The Villain Turns out to be a couple of minutes from 'The Champion.' What raised my eyebrows about this one is not the film - which looks very good... but then again, most copies of 'The Champion' look very good... but the price on the can - $4.50, which was an awful lot of money in 1928 (which is when this is from).
4. No. mfg. listed Busy Charlie Clip from 'Behind The Screen.' Nothing special.
5. Empire Safety Film Co. Charlie At The Beach I hoped I was getting part of 'By The Sea' here... nope. It's a cartoon.
6. Keystone Sleepless Night A couple of minutes of 'Police'
I have another batch to go through, but I'm out of Toy Film energy for now...
Anyone care to add to this list?