As an owner-resident in a Sydney strata of 32 apartments for 20 years plus now, I reckon I’ve seen just about everything when it comes to dodgy behaviour.
I find Lady Penelope’s laissez fair approach, backed up by technical tribunal decisions, most disturbing.
Any efforts, however subtle, to snavel Common Property by stealth such as is obviously occurring at Peter Gray’s strata should be nipped in the bud fast, especially if it is mucking up the place. If the Strata Manager won’t act and the Strata Committee won’t act, grab the stuff yourself in the dead of night and spirit it away somewhere. Neighbour should get the message.