Sounds like Whoopi paid $100 deposit to the OC for the scanner/key which is very common. I guess the $100 deposit covers lost/damaged key replacements. Normally an owner would obtain a scanner/key from the OC or building manager. There is no set amount of scanners/keys you are allowed to have, this is controlled by your OC. The legislation doesn’t mention scanners or keys at all.
I guess like anything else, should a dispute arise about a scanner/key and you cannot resolve the dispute internally with your OC, you could apply for mediation and may require a decision of the NCAT as a general dispute under section 232 of the Strata Schemes Management Act 2015.