If it’s been opened and had anything replaced, unless they’re better than 99% of the DIY steam deck crowd, they left small traces of getting past the backplate.
For what it’s worth, I believe the general consensus is that Valve cannot reject your warranty claim for the device having been opened under US law (the FTC has gone after other manufacturers for this).
For what it’s worth, I believe the general consensus is that Valve cannot reject your warranty claim for the device having been opened under US law (the FTC has gone after other manufacturers for this).