My thinking is that Medicom/Sync (and others) who have released this and the other unofficially liscensed Brandalism statues may have hired sculptures to make small replicas/prototypes of the originals from detailed photos. This makes more sense as opposed to somehow 3d scanning the originals. Some of the designs look sooooo good (Flower Thrower, David and Flower Pot Angel) while others are way off (Monkey, Rat with Paintbrush, etc).

Plus if they did 3d scan the original (again, don't know how), then where is Winged Nike with CCTV camera for head, Banksy X Rodin's Drinker or his Lady Justice (my favorite scupltures by Banksy) or the others from the Bristol Museum show and Barely Legal?

I do suppose that since most of Banksy's actual sculptures are real artist's scultpures that he appropriates then modifies, that there might be small scale reproductions that one could do the same thing with.

For instance, if I wanted to make my own Drinker, all I would need to do is purchase this small Rodin Thinker (https://www.amazon.com/NBHUZEHUA-Thinker-Statue-Thinking-Sculptures/dp/B087N1F1RW/ref=asc_df_B087N1F1RW/?tag=hyprod-20&linkCode=df0&hvadid=472953277806&hvpos=&hvnetw=g&hvrand=16959089038305353930&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1016367&hvtargid=pla-990026195970&psc=1) and this small scale traffic cone (https://www.trafficconesforless.com/mini-cones.html)

Obviously if I wanted it to be as close to the original as possible I'd need to insure that the sizes of each corresponded accurately. But you get the idea.

Loads of Brandalism knock-offs on TaoBao. As Terry Fuckwitt pointed out they are pretty cheap and fairly nice. For those outside of China, you will need to use a buying service to purchase; I'd recommend TaobaoFocus (https://tbfocus.com). Used them before to buy cheap gifts for my nieces and nephews or to purchase knock-offs to custom paint.