This is a little technical tip I wanted to pass on since many others may have the issue of receiving a long list of client selections from a big shoot and you then need to manually scroll through your images to select and mark the selected ones. This is made even worse if your clients have written the numbers out of numerical order.
Once you have a list:
In C1 edit menu > Select by > File name list
Here you paste in your list and select whether the names are separated by spaces as in vertical list of numbers or by commas in a comma delimited list. Click ignore extension so that if your client has chosen from jpg and you want to find RAW it will find them. Once selected you can choose to either 'move to selects folder' or 'make new album from selection' to isolate them.
I have some clients like ad agencies who are very tech savvy and provide ordered lists but also some non tech savvy clients who if not given a better option will send you selected images back with filenames chanced to something like coverimage.jpg which makes searching impossible except visually by date and time.
For this I have started using shootproof.com which provides and easy interface for clients with no image software and provides me with a list of their selections I can paste into C1 and save hours of my life.