Went back to the store this afternoon with more time to look through all the fixtures stuff. Sad news (attn: Jeepster04), someone else found the back-room-behind-another-back-room in the auto dept where the blimps had been near a cabinet full of wheel weights and those wheel weight hammers. All of that stuff was gone now, just empty cabinets.
I did find a few more things to get, a lightly-used 48in Empire ruler that they wanted $10 for (based on the liquidation manager hiding in an office and throwing out an arbitrary number when the cashier called him on the phone), but when I showed the cashier the current price at Home Depot was $10.97, they came down to $6. Didn't really need it since I have a couple other long rulers already, but not quite the same. Threw in a handful of other small things free again - some different lanyards that I hadn't found before (red with white 2004-2010 logo, and blue with same logo + some department names), a different pinback button from around the time of the SYW launch in 2009, a couple other odds and ends.
I confirmed that you definitely cannot use points on anything properly rung up under the fixtures code. So the guy who said he was able to buy fixtures stuff at his closing store with points must've either been buying normal merchandise in the same transaction and the points went towards that, or else those cashiers were using the wrong code.
And about those long power strips in the fitness equipment area, those were 6ft long, and I found a shorter but similar one today in another part of the store that had a price on it... I think it was about 2ft long, very well-used, and they wanted $15 for it.

You can spend about that much to get a nicer brand-new one at Home Depot. So I doubt the 6ft one is worth asking about.