Trumpy:
The box in pic 1 is commonly called a 'bell box', or 'FS' box. They are used for installing a device, with a cover.
Commonly installed outdoors, and surface mounted. Available in single and multi gang, with various hub sizes and locations.

We also have round ones, usually used for lighting fixtures. A good place to see all the variations would be www.mulberrymetal.com

The other item in the pic is a 'C' condulet fitting; used for pulling purposes. It must be installed in an accessable location.

The box mounted in the 2nd pic could be for mounting a device, or using the rear hub, connecting to an interior wiring method.

Please keep in mind the descriptions are for the usage of the items described by a professional. The intended usage by the person that did the work in the pics is unknown.

Last edited by HotLine1; 06/07/15 10:17 AM. Reason: corrected link
John