[franklinx]

Actually Guys , I asked this question just today to that same postal worker I know. " If I use a dense cardboard on the out side of my "photo's", would the cost be higher?"
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His answer.
"Depends on the person taking the package. As a general rule, if we cant slightly bend the package with our hands. We cannot send it as a document/photo. And there would be a cost increase"
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So using a decoy could cost you more. Its a crap shoot, depending on who serves you. I suggest you use, if I want to make a deal with someone that requests extra support. An extra top loader or 2 placed upside down with the loaders containing your trade cards. This helps keep the package more stable, yet it can still bend enough so as to not be too ridged.