Grass box for ride-on mower

Darn!!!! Posted too soon! I meant to say
Has anyone heard of such a thing?
And if so, where would I get it?

Why not try Ebay? If you have the Make/Model or serial number of the mower, some sellers do spare parts for various items. Or do a Google search for it and see what comes up.

Good advice from Pepper, or perhaps try your local lawn mower service engineer who might be able to help?

I’ve never seen one with a grass box, friend of MrOops has a ride on, I think if you do it often enough the short clippings just stay on the grass.
Although it’s easier for him to live with bits of grass everywhere as it’s more a field than a lawn.

Thats exactly what my lawn looks like! He's happy but not me, especially when the grandkids trample it into the house.
I should have thought of Mr Google.

Big question - how efficient are they?