These, the rounded hook worked the best. After letting them soak in bleach water I used that one to go underneath or the middle and pluck them off. Not easy and is a long process, but worth it at least for me. Lol
TEKTON 6943 Precision Pick and Hook Set, 4-Piece https://www.amazon.com/dp/B000NPPBQK/ref=cm_sw_r_cp_api_i_MgPLDbBANYS6Y
Naturalist's Guide to the Atlantic Seashore: Beach Ecology From The Gulf Of Maine To Cape Hatteras is a really good field book that covers Virginia.
You can also try using a cellphone app like Google Lens to identify plants and animals. Even if it doesn't give you the exact species, it can at least give you an idea.
I think it’s a piece of hardware or a clasp from snag or purse.
Like this:
Darice 1972-74 Magnetic Purse Clasp, Silver https://www.amazon.com/dp/B001E5XRLE/ref=cm_sw_r_cp_api_glt_fabc_EADKP7RQ4S7P3SM7HK3R
But fancier: