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If you have a posture box, replace it no matter what. These are the box springs that have nothing more than a few cheap pine slats. If you had a semi flex grid, which is usually more wooden slats with a heavy wire frame over it, put a straight edge over it and check for a sag in the middle. If it doesn't have any sag, you can probably get away with it for a bit. Unless you had a top of the line mattress before, you probably don't have a grid, which uses even more slats and rectangular coils to absorb loads from the mattress.
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Living in the United Socialist States of America.
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