I thikn before yous ell you first need to decide what is most important to you.
Do you want to maximize the money you get from selling them or are you more intersted in just getting them out of your possession. The former will likley entail consdierabel effort in researching going prices, taking multiple photos of each pen and posting individually on mutlpe board and fb groups to make sure you hit he broadest swath of potential cusotmer. If, howeverm you lean toward the latter, and just wan tthem to move quickly and hoopefully find good homes, you can post a group shot and do a "$50 each, firs pm gets it" type sale (obviously setting the price approriately for what you have). It is also possible to go a hybrid route and take the effort for a few particulalry valuable piece and then try to unload the rest.
Hope that helps.
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