FYI, the catnip that comes with scratching toys is often pretty shit quality. If you really want to treat him to the nip, get some high quality stuff. From the Field and Yeowww! are two brands that seem to usually be pretty high quality, and silvervine is a related plant that may be even more potent for some cats.

https://www.fromthefieldpet.com/ https://yeowww.com/our-products/catnip/