I've been watching a sandboxed site (competitive term), and lately I've seen it pop into the SERPs occasionally (never ranked in the top 1000 before). Assuming that this was a sign that it was only ranking on some datacenters, I decided to look at the different datacenters to compare the results. Most of the datacenters still show it sandboxed, so I'll just use the term Most DCs to represent those. I'll use actual IP addresses for a couple that show it in the SERPs. (Note that it still doesn't rank well even in those, but at least it is somewhere).
Most DCs
Rank: Not in top 1000
Allinachor: Not in top 1000
Backlinks: 21
Pages indexed: 12,700
216.239.53.104
Rank: 116
Allinanchor: 6
Backlinks: 348
Pages indexed: 41,000
66.102.11.101
Rank: 155
Allinanchor: 5
Backlinks: 540
Pages Indexed: 41,100
There's not much to be said about the numbers that aren't obvious, but thought it might be interesting to pass on. Maybe it will spur you on to see what the differences might be for your own site. I used the McDar Keyword tool to get the data.