2nd Hand Printer with paper underneath?

Hello everyone. I recived a broken 500mm ratrig 3.1 as a gift. After some lovely people in the fix my printer channel helped me get it going again i am now trying to level the bed. Upon Closer inspection there appears to be many paper shims between the PEI and the magnetic pad. After Removing the shims this is my mesh result. I will send a picture of the mesh before I removed the paper. I do not beleive this is a common practice? I assume the possibility frame isnt square and they did this as a stop cap.
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