Hi rikelme,
Post #2 here outlines some of the steps you can check if you have some softening or comfort issues with your mattress but the first step is always to talk with the manufacturer or retailer of your mattress.
I can’t see your mattress (a picture would help) so I don’t know if what you are experiencing is normal or unusual (different people have a different definition of a slight impression) but it is normal for any mattress to go through an initial softening or break in period and this will happen faster under the heavier areas of the body than it will under the lighter areas of the body or the parts of the mattress that aren’t used. It’s also normal for each person to take some time to get used to a new sleeping system. Turning the mattress 180% (or 1/4 turn in the case of a king size) can help even out the process. This doesn’t usually lead to significant impressions though although some initial very slight impressions are normal (and this would also depend on the materials and quilting in the cover because if there is natural fiber in your quilting then it will have a slight impression as well).
You can also check to see if a specific layer is impressing by laying it out on the floor and then putting a straight edge or a string across it to highlight any impressions.
I don’t know … you would need to ask them.
Again you would need to ask them what they do with their returned layers. It’s not likely at all though that they would re-use them in a mattress.
It would be helpful to have a picture or to know the exact layering of your mattress (including the cover and quilting). If it is one of the latex layers that is impressing then you could determine this by putting it on the floor so you can “track down” where the impression is coming from. It would be unusual for latex to do this although it’s certainly not unheard of either (you can see a few reports on the forum of similar experiences) and there will always be some percentage of latex (or any material) that is defective in which case it should be replaced. Before you replace it though I would make sure it’s the latex and not caused by other layers, components, or parts of your sleeping system.
Hopefully you will have a chance to talk with them and of course I’ll be interested in hearing what they have to say.
Phoenix