This question is very common to you. You can use the following methods to obtain evidence:

1, witness testimony-ask colleagues to prove that you did work during this period.

The photos you took are very valuable and can be used as key evidence.

As for the company's signature information, it is not necessary to copy it. This evidence can be applied to the court for your evidence before the trial. Or when the court orders employers to give evidence, they take the initiative to take it out.