2009 Proof Set Disapointment

I examined all of my 2009 proof coins (2 clad proof sets, 2 silver proof sets, 1 Presidential dollar Proof set) and found toning only in one of the four cent lenses. The toning is very mild but if it continues, I think that it will not look very good. All of the coins are in their original lenses and one of the 2009 silver quarter packs (the one with the NMI error quarter) has been opened numerous times as I examined, scanned, photographed, and finally sent the NIM coin to PCGS. They have been stored in a large mint blue box (the four lens kind they no longer sell) or in my safe (the silver). The mint boxes with the copper & nickel coins is kept in my nightstand which is lined with cedar and I know from experience that a raw coin left out in that environment tones rapidly (in a matter of weeks or months) and usually with brown tones that are not particularly attractive. I suspect the cents that have started to tone were not fully cleaned prior to leaving the mint and that the toning is mostly due to chemical residues left on the coin surfaces. I never understood why the mint tried to treat the copper cents to prevent unattractive toning when the cents in my proof sets from as far back as 1957 are all still brilliant red (and I assume that they were not treated in any way). I think that in trying to solve a problem that did not exist, they actually created the very thing they were trying to prevent. Bottom line: 4 of my 72 2009 proof coins (5.6%) have at least some toning and it is not attractive. The other 68 (94.4%) are as they were when first received.