The cache IS at the posted coordinates.

The Challenge
Find 21 caches with unique difficulty/terrain rating combinations in a single day.
Feel free to click on the Project-GC banner, below, to see if you've completed this challenge:

The Details
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You can find more than 21 caches during that day.
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You can find more than 21 difficulty/terrain rating combinations during that day.
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All cache types are eligible.
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The single day runs from midnight to midnight.
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You cannot include this cache among your 21 qualifying finds. You also cannot include the “Brass Cap Cache” (GC43F3), since its difficulty and terrain ratings constantly change.
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If you want to see if you qualify, then you can generate your profile statistics at this website. But you’ll have to create an account there.
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Normal geocaching conventions apply. You cannot find your own caches. Use the proper dates for your find logs. Etc.
Logging this Cache
You can sign this cache’s physical log sheet at any time – before, during, or after your qualifying day. But do not log an online “Found It” until you’ve signed this cache’s physical log sheet and shown that you’ve met the challenge requirements. We’ll delete any premature “Found Its.”
If you sign the physical log sheet before you complete the requirements, then you can log an online “Write Note” to help you remember this fact.
Providing Proof
One of the things you must do before claiming an online “Found It” is show that you’ve met this challenge’s requirements. You can do this in various ways, but you must include (at a minimum): (1) the date you found the qualifying caches, (2) a list of 21 GCCodes, and (3) the difficulty rating and terrain rating of each of those 21 caches.
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For example, you could create a publicly viewable bookmarks list.
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Or, you could include the list as part of your online log. The Project-GC challenge checker's output (see above) might assist you in this task. For instance, here’s a full list of our 21 qualifying finds:
On October 1, 2011, we found these caches:
1.0/1.0 - GC30G27 1.5/3.0 - GC2Y4DK 2.5/2.5 - GC34G00
1.0/1.5 - GC30522 2.0/1.0 - GC2CT2F 3.0/1.5 - GC2AG1Y
1.0/2.5 - GC29060 2.0/1.5 - GC2AXQ1 3.0/2.0 - GC34HJF
1.5/1.0 - GC32AA3 2.0/2.0 - GC34FZE 3.0/3.0 - GC32AN8
1.5/1.5 - GC2TPQT 2.0/2.5 - GC34FPP 3.5/1.5 - GC324NZ
1.5/2.0 - GC32JV6 2.5/1.5 - GC34FVF 3.5/2.0 - GC324QX
1.5/2.5 - GC2Z5FJ 2.5/2.0 - GC3280Q 4.0/2.0 - GC324QH
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Or, you could use third-party software to create your list and upload an image of that list to your online log. For instance, here’s a full list of our 21 qualifying finds:

Credits
We got the basic idea for this challenge from acpape0’s “One Day D/T Challenge” (GC3CGPC). The original “Well Rounded Cacher (The Fizzy Challenge)” (GC11E8N) was created by Kealia.
Congratulations to One Bad Ant for being the first to complete and find this challenge.