No. The last operating carrier will be responsible for delivering the bag to you. That is also why you have received a LH reference No; your point of contact is LH regardless where your bag misconnected.
I would wait until the bag is delivered. From the rush baggage tag on your bag, you will be able to tell where the bag misconnected. You may also be able to see it in the WorldTracerWeb system (you should be able to log with name and LH reference No.). Once it is clear where you bag failed to make the flight, you turn to that carrier for reimbursement. You may also stick to LH and let LH seek reimbursement from UA, if this is a UA issue.
AC has nothing to do with this; neither has the ticket issuing carrier. Either it is UA or LH as they were the operating carriers.
If you have travel insurance it is far easier to get reimbursed there. Keep all receipts; you are going to use originals for the reimbursement. You will get reimbursed for any reasonable purchases made until the bag is delivered. There might be a monetary limit but I'm not aware of policies of LH and UA on this.
Most likely your bag will turn up at some stage. 48h and no trace of it does not mean that it is lost.
Last edited by SK AAR; Oct 9, 2017 at 3:28 am