The phrase is not inherently false. Complete collections do exist. They do come up for sale. But the word "but" is the most important word in that sentence.
A tiny embossed Diamond Distributors logo in the lower-right corner, visible only under magnification. Reprint: Smooth, logo-less, and often slightly off-center because home printers cannot match commercial registration marks. DD Polly Sets 1 75 Are All Available Here But...
Based on the search results, "DD Polly Sets 1-75" appears to refer to the , which are likely related to farm loan programming or data sets used in specific administrative or technical contexts. The phrase is not inherently false
If you see the full DD Polly Set 1-75 listed, don't let the FOMO blind you. Ask the seller three questions immediately: visible only under magnification. Reprint: Smooth