I have done a combination of things when I do a closet clear out of Dooney bags. I give ro friends and neighbors, give to churches that collect donations and have sold online.
Most of my bags have sold on Poshmark. I liked all my bags, some were NWT's and a few were carried just a couple of times.
Dooney is such good quality that they sell quickly. I sold six bags on Poshmark in less than 2 hours. I sold Alto bags for up to $165.00.
Take good pictures, the style, size, color and any flaws. I write all reasonable offers considered. Poshmark has a 20% commission fee. Ship quickly (I ship within 24 hours). If you sell at asking price, wait 3 hrs. before shipping because they can cancel the order. If you negotate a cheaper price with the buyer you can ship right away. Buyer pays shipping and 5lbs. Is the max weight for the shipping price (I think it is $7.95).
On Poshmark I wrap in new white tissue, place a thank you sticker or note, I usually use a clear plastic bag for protection and ship in a box. You can get free priority white boxes at USPS. Only Poshmark sellers can use these.
Ebay is 10% commission and you can place shipping at calculated and Ebay charges based in buyer location (USA only). This gets deducted from the total before you are paid. You need your own boxes.
Dooney buyers love the quality and they sell quickly, but be honest, treat buyers with respect, package well, ship quickly and rack up the good seller feedback.
I hope that helps. Good luck and make some room to buy more Dooney bags for your closet.