My Rebas were OEM. From Merlin, with my Rock Lobster 853 frame (£400 the both! Bargainous!). They had one spacer inside, indicating they were set to 100mm travel, with the other spacer in the placcy bag that came with the forks. I’d say it’s quite likely they are actually set at 100mm, not 80, but you’ll struggle to see more than 85-90mm travel out of them, as you have to almost hit the crown, to achive 100mm. Setting them to 115mm sees you actually getting over 100mm. At 80mm, you’d get 70mm travel, really. Only when you really bottom them out after a big hit, do they get the full amount.
PP told me this, and it’s true!