Circuitry and methods for an efficient FIFO memory are provided. An example method includes receiving compressed media content, decompressing the payload of the compressed media content, generating a signature of the decompressed payload, discarding the decompressed payload, embedding a code in the compressed media content, and storing the code and the signature in a database for later use in identifying presentation of the media content at a presentation site. The vent seal allows for venting as required, while also serving as a flow restrictor to reduce the leakage of fluid from the vent tube in the event of sloshing within the reservoir. The brim may be fastened to the crown rearward of the aperture in such a way to allow relative movement between the crown and the brim.