I think these veiled busts may all be intended just as veiled and cuirassed. The depiction does vary a bit .. on some the cuirass is visible on the near (emporor's right) shoulder, while on others it seems to be the veil itself that is draped over this shoulder. On some there is a loop of drapery on the far (emperor's left) shoulder, even when the front of the cuirass is visible and it's not a draped bust as such. The depiction of the emperor's chest also varies - sometimes clearly just a cuirass but other times more ambiguous... I think RIC VI Trier was smart in just calling the bust "laureate, veiled" and leaving it at that!
BTW, does Bastien illustrate RIC 266 (eagles either side of garlanded alter, plus eagle on top) ? RIC only lists a BM specimen which doesn't appear to be in their online database. I wonder if it could be a worn specimen of RIC 268 which is the same but with flames on top of the altar instead of an eagle ?