Reward for lost pet

I’m not sure it will make a difference but you can try. Social media too.
In this hot weather, cats often go exploring and get trapped in sheds, garages etc. Ask your neighbours to double check. Ours got stuck in the neighbours hen coop once. The hens stopped her getting out!
Good luck. I hope you find him/her.

People who care about animals won't care about a reward.
People who do not care about animals won't be swayed by a reward.
Wave free money about and you'll only attract one sort of person.

If your cat has a microchip contact CatID https://online.catid.be/.
Tel. 02 333 49 94 Email info@catid.be Helpdesk is open daily from 8am to 8pm.
Also notify idchips: https://www.idchips.com/nl/contact
Tel. 02 880 04 20 Email. info@idchips.com

Europetnet Email: info@europetnet.com Email. info@europetnet.com

Also notify your veterinarian and your nearest animal rescue shelter and any local cattery breeders in your area.

Has your cat come back?
I hope so.
Our cat once disappeared for 5 whole days. Reappeared on the 6th looking very distraught and thinner.
During that time, we put posters all around the neighbourhood, with a photo, specifically asking people to check that she was not inadvertently locked in a garden shed - our vet said that that happens in summer.
She has never gone missing again.

I agree with the others - don't offer a reward.