The yellow stickers are also present in some Flock marketing materials, so I'd definitely recommend getting a good shot of the sticker.

And if it does seem to be a Flock camera, add it to DeFlock! (don't worry about if the images on the site to make sure it's an ALPR don't include one from Flock that looks like that, they only have images for two of Flock's fixed camera systems, the Flex LPR, and the Standard LPR, but Flock has other designs.)

Yep, that mount specifically is extremely common for a lot of label slapper companies. Like they all look like that haha. Hex bolts to make it easier to attach, the pendulum mount, the cap, set screws and all.

Never seen a flock ptz camera myself so I guess I can't say much about that specifically.

I couldn't find any other cameras that have all the same physical characteristics that weren't just pictures either on Flock's website, or from other sites talking about Flock cameras.

I'm not entirely opposed to the idea that they're using an existing design, but it seems more likely to me that they simply had one custom-made, especially considering the fact that they have very specific needs, such as the ability to accurately read a license plate on a car, which they claim they can do while it's going 100mph, at 75ft away, both day or night, or the fact that their cameras have cellular connections built-in, which would require the existing design to also have a slot for a SIM card, or ability to install an eSIM.

Again, not saying it's impossible, but I'd consider it unlikely.