The only time you really need to use an unsealed would be if you are using it on a bottom feeder. For example, I have a wood bottom feeder with no catch cup, so I got a drip shield to use with an atty on it. Had to use a 510-510 shorty for atty to fit in drip shield, but had to make sure to get unsealed so juice could pass.

Not sure if you're able to return them yourself or not?