53 Pa. Stat. § 4432
Every owner of such junk shops and second hand stores shall provide and constantly keep a book, in which shall be fairly written down in the English language, at the time of every purchase of any such material, a description of all articles so purchased, the name and residence of the person from whom such purchase was made, and the day and hour of such purchase, and such books shall at all times be open to the inspection of any and every member of the police and detective forces of such city. Compliance with the provisions of this section shall be evidence of the innocence of a junk shop keeper or second hand dealer of any crime of receiving stolen goods, notwithstanding the fact that the articles may in fact be stolen. Nothing contained in this section shall be interpreted as limiting, or interfering with, the title to, or right of, possession of the lawful owners of the articles.
53 P.S. § 4432