$n$ balls are placed independently uniformly at random into $n$ boxes. One box is selected at random, and is found to contain $b$ balls. Let $e_n$ be the expected value of $b^4$. Find $$\lim_{n \to 
\infty}e_n.$$
1. We start by considering the problem of placing \( n \) balls into \( n \) boxes uniformly at random. We are interested in the expected value of \( b^4 \), where \( b \) is the number of balls in a randomly chosen box.

2. Without loss of generality, we can always choose the first box. The probability that the first box contains exactly \( k \) balls is given by:
   \[
   P(B_1 = k) = \binom{n}{k} \left(\frac{1}{n}\right)^k \left(1 - \frac{1}{n}\right)^{n-k}
   \]
   where \( B_1 \) denotes the number of balls in the first box.

3. We need to find the expected value of \( b^4 \). This can be written as:
   \[
   e_n = \mathbb{E}[B_1^4] = \sum_{k=0}^{n} k^4 P(B_1 = k)
   \]

4. To simplify the expression, we use the fact that for large \( n \), the binomial coefficient and the probabilities can be approximated. Specifically:
   \[
   \binom{n}{k} \left(\frac{1}{n}\right)^k \left(1 - \frac{1}{n}\right)^{n-k} \approx \frac{1}{k!} \cdot \frac{1}{e}
   \]
   This approximation holds because:
   \[
   \lim_{n \to \infty} \binom{n}{k} \left(\frac{1}{n}\right)^k = \frac{1}{k!}
   \]
   and
   \[
   \lim_{n \to \infty} \left(1 - \frac{1}{n}\right)^{n-k} = \frac{1}{e}
   \]

5. Therefore, for large \( n \), the probability that the first box contains exactly \( k \) balls can be approximated by:
   \[
   P(B_1 = k) \approx \frac{1}{k!} \cdot \frac{1}{e}
   \]

6. Substituting this into the expected value expression, we get:
   \[
   e_n \approx \sum_{k=0}^{\infty} k^4 \cdot \frac{1}{k!} \cdot \frac{1}{e}
   \]

7. The factor \( \frac{1}{e} \) can be taken out of the sum:
   \[
   e_n \approx \frac{1}{e} \sum_{k=0}^{\infty} \frac{k^4}{k!}
   \]

8. To evaluate the sum \( \sum_{k=0}^{\infty} \frac{k^4}{k!} \), we use the fact that the series for \( e^x \) is given by:
   \[
   e^x = \sum_{k=0}^{\infty} \frac{x^k}{k!}
   \]
   By differentiating this series four times and then setting \( x = 1 \), we can find the value of the sum.

9. Differentiating \( e^x \) four times:
   \[
   \frac{d}{dx} e^x = e^x, \quad \frac{d^2}{dx^2} e^x = e^x, \quad \frac{d^3}{dx^3} e^x = e^x, \quad \frac{d^4}{dx^4} e^x = e^x
   \]
   Therefore:
   \[
   \sum_{k=0}^{\infty} \frac{k^4}{k!} = e \cdot (1^4 + 4 \cdot 1^3 + 6 \cdot 1^2 + 4 \cdot 1 + 1) = e \cdot 15
   \]

10. Substituting back, we get:
    \[
    e_n \approx \frac{1}{e} \cdot 15 = 15
    \]

11. Therefore, the limit is:
    \[
    \lim_{n \to \infty} e_n = 15
    \]

The final answer is \(\boxed{15}\).