Upon further inspection I noticed some gold highlighting from the coins have come off, once again not sure if it was the manufacturers or the customs fault. I have contacted the manufacturer regarding the matter, they told me that the coins might have gotten to much direct light outside of the capsule.
I'm sure I'll never use this manufacturer ever again. A huge disaster.
Direct sunlight will ruin the gold-plating on a coin? Didn't know that. (You learn something new everyday, right?)
Really, how long could the coins have been exposed to direct sunlight in the short time between minting and packaging? It's very hard to believe that a mint employee would lug the box of coins outside, spread them out in a single layer on the back steps, and leave them to bake in the sunlight all afternoon. I'm inclined to think the fault is not sunlight, but poor quality control inside the mint. (But I could be wrong. Often am.)
Hopefully, the mint will fix everything soon.
Regards,
Me