There are 94 safes and 94 keys. Each key can open only one safe, and each safe can be opened by only one key. We place randomly one key into each safe. 92 safes are then randomly chosen, and then locked. What is the probability that we can open all the safes with the two keys in the two remaining safes?
(Once a safe is opened, the key inside the safe can be used to open another safe.)
To solve this problem, we need to determine the probability that we can open all the safes with the two keys in the two remaining safes. Let's break down the problem step-by-step.

1. **Understanding the Problem:**
   - There are 94 safes and 94 keys.
   - Each key opens exactly one safe.
   - We randomly place one key into each safe.
   - We randomly choose 92 safes and lock them.
   - We need to find the probability that we can open all the safes using the two keys in the two remaining safes.

2. **Key Insight:**
   - If we can open all the safes, it means that the two keys in the two remaining safes must be able to start a chain reaction where each opened safe provides a key to open another safe.

3. **Expected Number of Open Safes:**
   - Let \( e(k, n) \) be the expected number of open safes when we start with \( k \) keys and \( n \) safes.
   - The first open safe may:
     - With probability \( \frac{k}{n} \), give no useful keys (the key inside opens one of the already open safes).
     - With probability \( \frac{n-k}{n} \), give one new useful key (the key inside opens a new safe).

4. **Recurrence Relation:**
   - The recurrence relation for the expected number of open safes is:
     \[
     e(k, n) = 1 + \frac{k}{n} e(k-1, n-1) + \frac{n-k}{n} e(k, n-1)
     \]
   - Boundary conditions:
     \[
     e(n, n) = n, \quad e(0, n) = 0
     \]

5. **Guess for Expected Value:**
   - Based on experiments with small \( k \) and \( n \), we guess:
     \[
     e(k, n) = \frac{k(n+1)}{k+1}
     \]

6. **Probability Calculation:**
   - For probability, let \( p(k, n) \) be the probability that we can open all safes starting with \( k \) keys and \( n \) safes.
   - The recurrence relation for the probability is:
     \[
     p(k, n) = \frac{k}{n} p(k-1, n-1) + \frac{n-k}{n} p(k, n-1)
     \]
   - Boundary conditions:
     \[
     p(n, n) = 1, \quad p(0, n) = 0
     \]
   - We guess:
     \[
     p(k, n) = \frac{k}{n}
     \]

7. **Applying the Guess:**
   - For \( k = 2 \) and \( n = 94 \):
     \[
     p(2, 94) = \frac{2}{94} = \frac{1}{47}
     \]

Conclusion:
The probability that we can open all the safes with the two keys in the two remaining safes is \( \frac{1}{47} \).

The final answer is \( \boxed{\frac{1}{47}} \).