Encodes the base64 code you copied. Toward the end is == in the middle of the code. This is a placeholder that fits at the end of base64 code.
Remove the part after == and it will work fine.
<img src="data:image/svg+xml;base64,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"/>
Demo: http://jsfiddle.net/Lsr4s/2/
Edit:
Downloading an svg file from the encoding of the site and base64 gives exactly the same result. If there is no signature that you can use to easily fix the code, this is what you will need to do.
I used C # code like this for base64 encoded image in a text file:
File.WriteAllText(@"d:\temp\baggage19.txt", Convert.ToBase64String(File.ReadAllBytes(@"d:\temp\baggage19.svg")));
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