You should write that down and report back with results.
There have been reports of immigration officers actually checking the residences you are registered to. I would imagine it all ties in with the new rule of informing immigration every time you move or change residence within 24 hours.
If you don't have a visa already in your passport they won't let you fly without a return.
The airline saw that I didn't have a return ticket and initially refused me boarding. That was until I pointed out that I already had a visa in my passport secured from the Thai consulate in London.