OP s4envi:contains link a physical object and the physical objects that can be contained in it. The “can” in this definition makes it ambiguous; The domain and range is not defined; Physical objects are relevant for other extensions and could be promoted to SAREF Core, together with this property.
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I'd propose to at least change the name to remove the ambiguity.
I inspected the ontology and found that s4envi:contains is not used in the examples and only mentioned as a property that can be applied on a PhysicalObject. We may remove the "can" and promote it to core along with the PhysicalObject.
I don't see the word "can" ambiguous, sometime it is used for properties that may be used or not, that is for cardinality 0..N. But agree to rewrite the comment.