I’ve republished ServiceStack package to MyGet again, as this looks like it’s only affecting the first package published there might be an issue between clearing out the packages and republishing them again where the first package ServiceStack may be marked as to delete despite being published after the delete command.
I’ll try adding some delay after clearing the packages before redeploying them again to see if that helps.
<Error>
<Code>BlobNotFound</Code>
<Message>
The specified blob does not exist. RequestId:29911219-0001-0008-5a77-b5e969000000 Time:2015-07-03T10:05:54.0812670Z
</Message>
</Error>
Is this definitely a problem with your CI build or could it be a MyGet issue?