In the book Sphere by <PERSON>, there was a spaceship which survived crashing into an ocean and was there for centuries. It was in deep water, and had little signs of decay. The majority of the systems inside operated just about flawlessly.
This scenario is pretty believable because objects can survive deep underwater for a very long time because the environment has very little oxygen in it which tends to break down anything metallic fairly quickly in the water. There are also few organisms at extreme depths which will attack the exterior. If the hull remained in tact, then something like this could survive in tact for thousands of years.
The problem with having technology like this above ground is that it has a high likelihood of being tampered with. Nearly every metal object made by humans in deep antiquity no longer exists, regardless of the type of metal they are made with. Most of these objects are destroyed by natural decay, etc. 322
If you study ancient stone buildings, there is evidence of them being held together with metal rods and clamps. The only thing remaining is the holes that were left behind. There are some objects that still exist which are made out of gold and other precious metals. However, there is a high likelihood that the objects will be stolen by treasure hunters and melted down, or removed from the context sufficiently that people would not be able to recognize these objects as technology.
There are two main things you would need to keep in mind when designing something that will last for centuries. The first is make sure that the material itself is durable enough to survive the wear and tear of time. The second is to conceal it to avoid tampering by people who aren't yet ready to use or understand the technology.
I think the best way the preserve technology for the distant future is to encode all the information needed to recreate it in the future on objects which have very little value in them such as clay or stone tablets. These materials can survive for many thousands of years. 111