go to this page:
COVID USE BY DATE
scroll down till you see the type of COVID test you have, they have pictures of the boxes, I chose the BinaxNOW as a sample there are lots of other choices
to the right of this picture are blue words saying Extended Expatriation Dates, This is where it gets semi complicated. FOR boxes of tests you already have, not the ones that arrived today, you need to check the lot number of the test against a list that will download to your computer. Sample lot numbers:153349, 153364, 153476, 153495, 153551, 153658, 153670,154406, 155063, 155512, 155582, 156371, 156374 any box with those lot numbers has already expired. You can throw it out.
You can find your lot number on the box itself With the number from your kit as an example my kit has the number 199176, I look for that number on the document that downloaded to my computer from the webpage, if the number is not on the page then the expiration date for that test you've been saving has passed and you can throw it out in the garbage. Most likely the test liquid has evaporated so you couldn't use it. (However,if you have a desire to collect long handled swabs you could keep those)
OR to the right of the picture you will see expiration date see box label
For the boxes that you received today, the expiration date on the box is the expiration date. (At least that's what I'm seeing online) I haven't receive my shipment of test kits yet, they are coming Wednesday.
Does this help?