Is it Pushfeed or CRF? Cheap factory synthetic, laminated, or walnut? Much more info needed. It could be worth $200 up to $700 depending on the exact model. The 280 chambering could work either way. Probably 90% of the shooters out there wouldn't buy it at any price. 7-8% would buy if the price were cheap enough and 2-3% would pay a premium. You'll see the same things about the BOSS system.
I'd guess it is one of the CRF Classics. I don't think they put the BOSS on any of the PF models. I had a 1990's vintage 280 FWT in a green/brown/black laminated stock at one time. No BOSS on my rifle.
If it is a CRF Classic in a walnut stock, $500-$700 depending on how bad someone wants a 280 and BOSS. Winchester never made many 280's period. I'm in the camp that would pass altogether, but if someone wants that combo it will be a unique rifle that is fully capable of hunting anything in NA.