To get verified go to Listia support on their web page and click on account verification. Here is the reason it's so important: To protect users from fraud, there are a few methods of account verification that help buyers avoid untrustworthy sellers. Verification is optional but highly recommended if you want to show that you are serious about your listings.
Strap drop is measured from middle top of strap to middle top of purse. And verifed means is your address verified with Listia and also if your address is not verified and if you bid on something the seller will not mail it to you till your address is verified.