the date of printing

Hello colleagues,

in connection with the investigation of a person who died under unclear circumstances, it is necessary to examine a printed document. The document file has been deleted and cannot be recovered, but the printer has been seized. There is a possibility that the document was printed several days later than the indicated date. The Prosecutor's Office in Bulgaria is looking for a specialist or a laboratory in Europe that can date the document.

Could you give me some ideas or direct me to a lab?