As per scrubby, all mower filters, both genuine & aftermarket have a bypass
Some auto filters don't because the bypass is built into the filter housing
So if the mower shop claimed that sent their quote to the company that makes the filters you were using.
The local Toro dealer tried that with one of my customers , I sent the details to Stens and within a week the dealer had sent a courier around to pick up the mower gratis , done a head swap ( both heads ) under warranty & returned the mower in 3 days .
I had a Husqvarna dealer try the same trick & I sent that quote to to my other wholesaler & had a similar outcome only they took 3 months to do the repairs so the owner bad mouthed them big time on Feaces Book to the extent that Husqvarna refused to renew the franchise .