OK I am going to take a stab in the dark here and say you had those on your device and they are now gone?
If they vanished recently, and nothing has been added to it since, then you can try the info I am including below. However if this involves a broken/non-functioning device or a stolen one, unless you had the files backed up to a cloud, google, computer, etc., there would be no way to get them back.
While there is no guaranty that you can get them back. Deleted does mean deleted. There are a few apps/programs out there that 'may' be able to help you recover the data.
A few of the programs you could try would be... DiskDigger, MobiSaver, Android-Recovery and Tenorshare. They are all data recovery apps/programs. There are many...