#3 Any sort of test kit
Similar to prescription medication and even medical equipment, the test kits are also treated like the other two: they are not covered by the return policy, and you should not expect to be able to return a health-related test kit that you can take at home. This includes pregnancy tests (so do not let your friends go wild when they are getting them) and also home-diagnosis tests, like the at-home drug tests.
Another item that has been included and that you may have stocked up on in the last few years are COVID-19 kits that you can take home. These are also under the no-return policy of Walmart, so you are better off donating them or using them if there is still a while until the expiration date.