This articles indicates ‘phones’ were found in the flat. No additional information was found on these. However clearly they had another phone which they took with them? All very odd.
Also, it says the landlord contacted the police straight away. As someone had noted, surely your first thought would be they hadn’t actually moved out yet, not that they were missing. They could have just popped out to the shop. Then when the landlord contacted the police it stated they ‘stood up immediately’. If police were contacted by a landlord who said they thought their tenants were due to move out, but that their belongings were still in the flat - I can’t fathom why that would result in a quick response? I rent out flats and wouldn’t think to contact the police in that situation. There must be more to all of this.
www.dailyrecord.co.uk
Also, it says the landlord contacted the police straight away. As someone had noted, surely your first thought would be they hadn’t actually moved out yet, not that they were missing. They could have just popped out to the shop. Then when the landlord contacted the police it stated they ‘stood up immediately’. If police were contacted by a landlord who said they thought their tenants were due to move out, but that their belongings were still in the flat - I can’t fathom why that would result in a quick response? I rent out flats and wouldn’t think to contact the police in that situation. There must be more to all of this.

What police said about missing Aberdeen sisters as search enters second week
Police Scotland held a press conference today, as part of the ongoing search into two missing sisters who vanished in Aberdeen.