I was given a set of Q7581A, Q7582A, Q7583A unopenned cartridges that were formerly used in a LaserJet 3800... I am runnning a Laserjet 3600 and was asking myself the exact same question you posted here.
Except for the "Genuine HP supplies designed for 3800" message, did you experience any printing issues with the high yeld Q75... cartridges?
Thank you for your help!
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