The only way that you can delete ten best days is when your BAM! cpid is the same as the stats entry where you try to delete them.
I have tried to change the cpid in BAM a while ago and just clicked it again to change it. The BAM cpid is pointing to this project and cpid.
https://www.boincstats.com/stats/169/user/detail/2187
I have not been user 169 for a long time over 6 months or even 12 months.
That project does not have that cpid on the project page but has the cpid of all the rest of my projects and that is this one
https://www.boincstats.com/stats/-1/user/detail/4350317/overview
This is the xansons for cod screen
Account information
Name Dingo
Email address boinc-australia@hotmail.com
URL http://dingo-den.com
Country Australia
Postal code
XANSONS for COD member since 23 Nov 2016
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User ID
Used in community functions
144
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Computing and credit
Total credit 1,587,705
Recent average credit 0.09
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The Knights Who Say 'Ni!'
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Cross-project ID: f82dc8c0703cb0764e0849345467b89e
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Stats on your cell phone http://xansons4cod.com/xansons4cod/userw.php?id=144