It is right about 3% like Ryug said. Me and my friend have been tracking our Coffers for some time. He has over 60 characters and I have 20. Both of our numbers are just about the same and he has done three times more than me.
The numbers are roughly between the two of us with close to 500 coffers opened between us. 65% Peridot, 5% Aquamarine, 27% Pres Ward, 3% Coal Ward.
I have 13 characters, and I'm pretty good about getting the 7-day boxes weekly, so in a month, that's 52 boxes a month (give or take). Of those, and I haven't really recorded the counts, I generally get 1 or 2 coalescent and 10-12 preservation wards each month. This tracks with the % chances baron335 mentioned, so I'd say 3% is a pretty accurate number.
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Sekhmet@kvetchus_
Guilds: Greycloaks, Blackcloaks, Whitecloaks, Goldcloaks, Browncloaks, Spiritcloaks, Bluecloaks, Silvercloaks, Black Dawn
Tredecim: The Cloak Alliance
The numbers are roughly between the two of us with close to 500 coffers opened between us. 65% Peridot, 5% Aquamarine, 27% Pres Ward, 3% Coal Ward.
Sekhmet@kvetchus_
Guilds: Greycloaks, Blackcloaks, Whitecloaks, Goldcloaks, Browncloaks, Spiritcloaks, Bluecloaks, Silvercloaks, Black Dawn
Tredecim: The Cloak Alliance
If it's 3.5% then I'm seriously unlucky/flagged.
I guess I'll wait another month and see if I get any.