Ummm...
hidden ship in Menelaus frontier...I assume you have the coordinates? Go to your ships command console, choose navigation, move to position. The sector map will open with a reticle you can move using the numpad cursors. Move the reticle, observing the coordinates at the bottom right changing as you do so. Position the reticle near to the position that the wreck is supposed to be, even if this means moving the reticle off the screen (don't worry, there's plenty of space 'beyond' the border of the sector map).
As for the hidden container, unless you're talking about something I don;t know about, allt he hidden containers are randomised to a certain degree, it could be anywhere. What makes you think there's a specific one in Ore Belt?
Lastly, when we talk about the hidden ships, we use the spoiler marks, some people don't even want to know what sector they can be found in, they want to find them on their own. A noble goal. You might want to edit the topic title too...good luck
Ore Belt at the top.