A bid is not a final price. If the scope changes then you manage it with a change request. If a risk becomes an issue then you should have already identified the impact in terms of additional cost, time and quality. In summary, it's just a price on what you already know about the scope. You can't rely on the client's definition of the project,these are things you must analyse yourself and provide your input as a professional.

I have a box to keep them in.

In this part of the world (the UK) that's covered by TUPE [Transfer of Undertakings (Protection of Employment)]. You take your rights of employment with you to the "new" company. I would have thought this would be the case in any civilised country.

This is about the occurrence of rare events. Rare events are very common, once you think about them correctly. Imagine this situation... "I went on holiday to the South of France, I've never been before. I went to the local marketplace and met Bob from my local pub! What are the chances of me being on holiday for the first time in France and meeting Bob!" Sounds incredible...but it's not. What you have to ask firstly is: What are the chances of me meeting somebody I know while on holiday? I may know 100 people and we might all go on holiday twice a year. So there are already 200 chances that I meet somebody who is on holiday. The number of opportunties that any two of us meet from this group of 100 is: 100! * 20 = 1800000000000000000000000000...+ 130 more "0"s That's 18 with 158 "0"s after it. So the possibility that one of those opportunities arises in the same place on the same day is extremely likely indeed. What seems incredible is that it happened to you. An easier number to digest is this one...How many people need to be in a room for there to be a 50% chance that two of them share the same birthday? 183 maybe? no...23. You can use the same maths above to work it out.