If the police mark a gun for evidence of any other reason those markings do not fall under the Federal statutes and ATF regulations. SNs and re-import markings are different than property room miscellany. Regulated "numbers" require a certain depth and a certain clarity. Miscellaneous scratchings on a gun are just that, unimportant miscellany for ATF purposes.
Those markings are in English, or at least a Romance language, so I'd rule out Israel as a source but they speak English there sufficiently that one never knows.
ATF Guidebook - (c) BATFE
https://www.atf.gov/resource-center/...onpdf/download