[mothered]

After I sent them an amazon receipt, they said "We do not authorize the sale of [...] products online except on our website. The only other websites that are authorized to sell [...] products are [..........]"
I guess I'm screwed.

Why are you targeting Gucci and not dealing with Amazon directly?

How do I deal with Amazon if I generated a fake amazon receipt? All they have to do is realize I never placed the order.

The same can be said for any other company who cross-checks the receipt- same difference.

Evidently the receipt will not come up on their systems (It's fake), hence It comes down to an administrative error on their end (so they think) and If your SE Is formulated & calculated enough to solidify the fact that the Item was received against the receipt, then the probability of a successful outcome significantly Increases.