Older iPhones with board damage

I’m looking for a few iphones in the range of 4-5S to use to kick off my start in learning board repair & soldering. Phones must have some type of repairable board damage and must not be water damaged or be locked in any way (iCloud/FMI/passcode/etc).

I have a box of older iPhones can’t tell you much about them some have been smashed but if you have a use for them…??? Let me know.

@Hysterteck
Sorry for the lack of response but would you be able to grab a picture of them if you still have them? I’d like to get an idea of what I’d be buying. I’m looking for phones that would be usable to some degree as I want to practice board repair. Ideally I’d like no older than the iPhone 4 as I’m not sure how hard board level components for older gens would be to source. Other than that, I was only looking for a few but if you’d be able to work out a good deal, I wouldn’t mind taking them.