Hi Raul,
You can verify that by creating a workflow something like below logic:
1) fetch all the recipients of delivery#1
2) Use enrichment activity and do reconciliation using recipient delivery logs. Keep join condition as email address. This will give you recipient delivery logs of email addresses targeted in delivery#1. It will give you all the deliveries those recipients are targeted.
3) Based on your target group you can perform your next action.
Thanks.