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and others that have sold in the past while to get a value.
the unfortunate part about using previous sales prices to price your item is that it is inevitably superseded in the eyes of buyers by current available pieces. If your willing to wait for those lower cost peices to be purchased and taken off the market in the hopes that the next wave of knives will either be priced at or above your current asking price you might be able to win out in the end, but you will have to wait for the market to clear wich could take months. If the new knives that come in to replace the lower cost knives your contending with are -still- lower than yours, you need to have something special that would attract a higher price, such as a rare finish or custom feature.
In this case, it's the sheath. Sad to say, but I doubt it will draw in buyers anymore than the equivalent 20$ kydex/cordura sheath. It all depends on how long your willing to sit on your investment.
You might also consider selling them separately, price the sjtac on the low end (265-285) and sell the sheath for around 40-60$ depending on it's condition. You will probably be able to move them faster and recoup your costs better than selling it as a package.