Please Return My File After Use, Thank You

We are graphic designers based in the Netherlands. We recently did a job for a charity in London, which was sponsored by a large computer company. In order to complete the job, we needed a copy of the computer company's logo. In due course, we received an email with a TIFF file of the logo. The text of the email asked that we return the TIFF file when we had finished with it. We did.