Question about Theft

We visited elderly relatives during a holiday who were staying at an organized vacation, and they gave us a bag with various items and foods that were distributed to them, and foods that were in the dining room. They told us they collected them from the tables because later the workers who clean throw everything away. The question is whether there is a concern of theft, (since there are some items in closed packages such as desserts, etc.)?

Hello 
If it is indeed customary that everything on the table is thrown away, it is permissible to take it. 

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