If the Mini 5 can show some wind resistance, it might be worth it, now that it's got a 1-inch sensor, just so you don't have to deal with more restrictions on where you could fly.
What grounds would there be for a return? DJI specs say that it weighs 499.9 grams +/- 4 grams. At 251.2, it's within the advertised specs. No complaint exists.
IF (And that's a big if.) there was indeed a police officer who weighed a drone at...
As a business there are a lot of financial records to manage Is your small business making a profit? Have you been filing IRS annual income taxes to include your business? If not, they I'd say you don't have business in flying. On the other...