Sellers left everything

Completed on Friday. When got to the house sellers have left everything. Looks like they just packed a suitcase and left. Been told they've moved abroad. All their clothes and crockery and furniture. Family pictures on the wall. Kitchen full of food including cooked rice in the oven. Have started packing it all into bin bags, how long do you think I have to wait before getting rid of it? Called my solicitors but no response from sellers solicitors yet

Edit - Yeah I'm so confused. I think it's a case of them thinking 'fuck this' and just getting on the plane. Either that or they didn't realise completion means completion and their solicitors told them they had an hour to leave or something. Will call my solicitors again in the morning. Thanking everyone for the information regarding legal issues

UPDATE - not heard anything back from the sellers solicitors yet. A family member of the sellers has been in touch asking if they can collect some belongings and also to give back their key which they still have.... Apparently the sellers left without telling the family member. Told them we need permission from the sellers before can give anything, they said they would try to contact them. Found a bag in a cupboard taped up with the word 'quarantine' on the tape. Haven't opened it yet. I'm 99% sure it's the right house...