I just had a very similar incident where a Canadian collection outfit emailed me a claim for damages for a recent Hertz rental. Interestingly they had the RA number for a recent rental correct. The amount they wanted was ~$800 which is just a small enough amount above a typical $500 deductible policy that some folks might just pay it. The company in Canada has a website that look legit but there was no damage during the referenced rental. I responded to them in an email that there was no damage so had no idea what they were talking about. Then I called Hertz corporate and the HLE I actually rented from (since corporate said that actual closout of a rental happens at the original renting location). Neither had any record of an issue with the rental. It looks to me like the scammer got a hold of the paper rental card which would have the RA number, the fact that damage waiver had been waived, and basic contact info. Either that or a Hertz employee at PDX (where I dropped the car off) is involved. In any case, it sounds like another scam to be aware of.