Years ago, pre-pandemic, I bought a bag of "Transformers parts" at a store in the Big City, with the intent on seeing how many I could id. Never got very far beyond "a lot of movie pieces" and buried it in a box.
Last night I rediscovered the lot and started, and as of today they fall into 3 categories:
1) What I know they go to.
2) What I know but not what version.
3) and "No idea".
I'll post category 3 first as it's relevant to the thread.

Full lot.

First half close-up. (Quarter for scale)

First half close-up, flip side.

Second half close-up.

Second half close-up, flip side.
Then category 2:

Shins, shoulder pieces, smokestacks (one with it's launcher from a Voyager movie Optimus, door (with a broken hinge) from a deluxe Bumblebee, a bigger Bumblebee door (human alliance?), rotor blades from a movie Voyager Blackout mold (not Grindor, his are black, side pieces(?) of a movie Optimus (Voyager?)
And finally, what I've confirmed.

(From left to right, top to bottom)
SWTF Boba Fett's arms, Deluxe 07 Bumblebee/Cliffjumper, PCC Skyburst back and wings, DOTM Deluxe Starscream's MechTech weapons,
Beast Hunters Smokescreen net, DOTM Mudflap 's mechtech weapon, Energon Starscream's sword, classics minicon Broadside's legs and Sledge's waist/thighs, rotf Dirge's chest piece, rotf Swerve's head, windows from rotf Gears, DOTM Thundercracker's non-mechtech weapon, half of rotf Desert Tracker Ratchet's roofrack
Generations FOC Whirl's cannon and sword, Topspin 's saw/cannon and blaster, Impactor's launcher and right hand (insert harpoon joke), road Buster's cannon, and the gun from a version of FOC Swindle.