The first Penn baptism for a Bunce is in 1758 -
2.4.1758 William s/o William & Elizabeth
buried 29.2.1766
6.6.1762 James - ditto -
24.6.1765 Ann - ditto -
16.8.1767 Hannah - ditto -
buried 6.1.1770
28.10.1770 William - ditto -
21.3.1773 Hannah - ditto -
11.8.1776 Mary - ditto -
11.3.1781 John - ditto -
buried 8.2.1782
9.11.1783 William base s/o Ann
25.1.1795 Elizabeth d/o William & Sarah
buried 4.6.1795
11.9.1796 William - ditto -
30.9.1798 John - ditto -
23.1.1803 Edward - ditto -
There are more in the 1810s and 20s, but I'm assuming - from what you said - that you've got those.
Additional burials -
22.1.1807 Elizabeth Bunce, age 70 wife of William, poor
19.9.1807 William Bunce, pauper
Jill