Unfortunately, RFID isn't straight. The different bits in the hex value belong to different 'fields', and it appears that the printed 'serial number' is a sequence of these fields rahte rthan a translation of the hex values. IIRC, "136" is the country marker, probably the '88' in the hex string. '585d' is the '22621' part. While the first '0008935517' probably is the manufacturer and RFID type key. YOur reader will filter this and report it by a different command or not at all. I had similar problems when I was working on my 'pig scales and bio impedance analysis' project (official name: ConditWatch). Take a deep dive into the RFID specification and the reader programming manual (if available), not just the users manual. Maybe you need to contact the manufacturer to get the required information.
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