@Flare I just want to confirm that Scott had stated that it is one of their frames. I know you previously mentioned that there were some Scott decals/logos on it (they may or may not have been original?).
It seems odd that Scott, who have only been making bikes for about 30 years, could not identify its model (if it is a Scott frame) given that they should be well aware of their serial numbers and having that gussetted down tube design which readily grabbed my attention when I saw it. You may want to post it on a more mtb oriented forum site, or compare it to examples found on a site like bikepedia (they do not always have photos or every model in a given year listed). Using your number as a reference I might make an uneducated guess that it is a 2011 model year assuming that the first 2 numbers indicate the year, but it is just a guess, although it may be a reasonable place to start looking at Scott models to see if it matches. You can try looking in past Scott catalogs if they are available online.
It certainly seems odd for a frame manufacturer to obscure their own serial number, but that shows how many frames are built; fast and without attention to detail. Just seeing that makes me think that it is not a Scott since I would expect higher quality work from that company, but they are mass producing bikes just like other popular brands so it is still very likely that is a Scott frame, but possibly not one of their top tier models.